Boss rush extra mode. Features Levels full of non-stop action, including highly hazardous environments: Underwater, Volcano, Space, Dark Cave Huge bosses that pack a punch. Navigate your UFO through hazardous environments with dangerous enemies and beat huge bosses. Classic multi-directional (360°) shoot 'em up. Optional scanline screen FX, as seen in trailer. 10 weapons (two same weapons stack up to higher power). Steam Trading Cards.
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